package com.example.community.controller;

import com.example.community.entity.User;
import com.example.community.service.UserService;
import com.example.community.util.CommunityConstant;
import com.example.community.util.CommunityUitl;
import com.example.community.util.RedisKeyUtil;
import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    @Autowired
    private UserService userService;

    @Autowired
    private Producer producer;

    @Autowired
    private RedisTemplate redisTemplate;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @RequestMapping(path="/register", method = RequestMethod.GET)
    public String getRegisterPage(){
        return "site/register";
    }

    @RequestMapping(path="/login", method = RequestMethod.GET)
    public String getLoginPage(){
        return "site/login";
    }

    // 获取验证码
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) throws IOException {
        // 生成验证码
        String text = producer.createText();
        BufferedImage image = producer.createImage(text);

        // 将验证码存入session，登录时需要验证 验证码是否相等
        // session.setAttribute("kaptcha", text);

        // 验证码归属
        String kaptchaOwner = CommunityUitl.generateUUID();     // 生产随机字符串作为key的一部分
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);   // 生效时间
        cookie.setPath(contextPath);    // 路径
        response.addCookie(cookie);     // 加入到cookie中，登录验证的是否获取到随机字符串，生成与之对应的key，从而获取到验证码

        // 将验证码存入redis，并设置过期时间为60秒
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        // 输出图片
        response.setContentType("image/png");
        try{
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e){
            e.printStackTrace();
        }
    }

    // 注册账号
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user){
        Map<String, Object> map = userService.register(user);
        if(map == null || map.isEmpty()){
            model.addAttribute("msg", "注册成功，我们已经先您的邮箱发送一份激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");
            return "site/operate-result";
         }else{
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));

            return "site/register";
        }
    }

    // 激活账号
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code){
        int result = userService.activation(userId, code);
        if(result == ACTIVATION_SUCCESS){
            model.addAttribute("msg", "激活成功，您的账号可以正常使用！");
            model.addAttribute("target", "/login");
        }else if(result == ACTIVATION_REPEAT){
            model.addAttribute("msg", "无效操作，该账号已经激活过！");
            model.addAttribute("target", "/index");
        }else{
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/index");
        }
        return "site/operate-result";
    }

    /**
     * @param username 用户账号
     * @param password  用户密码
     * @param code  验证码
     * @param rememberme    是否勾选记住该账号
     * @param model model
     * @param response  保存cookie
     * @return
     */
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, /*HttpSession session,*/HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner){

        // 获取session里面的验证码
        // String  kaptcha = (String) session.getAttribute("kaptcha");

        // 从redis中获取验证码
        String kaptcha = null;
        if(StringUtils.isNotBlank(kaptchaOwner)){
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);  // 通过cookie中保存的随机字符串生成唯一的对应的key
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey); // 在redis缓存中获取验证码
        }

        // 判断验证码
        if(StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg", "验证码不正确！");
            return "site/login";
        }

        // 是否勾选记住账号，以此来觉得登录超时时间
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        // 验证账号, 密码
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if(map.containsKey("ticket")){
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        }else{
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "site/login";
        }
    }

    // 退出登录
    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket){
        userService.logout(ticket);
        // 清理
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }


}
